<html>
     <head>
          <title></title>
          <script type="text/javascript">
          function ShowMessage(message)
          {
               alert(message);
          }
          function ShowWinFormsMessage() {
               var msg = document.getElementById('txtMessage').value;
               return window.external.ShowMessage(msg);
          }
          </script>
     </head>
     <body>
          <input type="text" id="txtMessage" />
          <input type="button" value="Show Message" onclick="ShowWinFormsMessage()" />
     </body>
</html>